Kurile Lake is located in the southern part of the peninsula on the territory of the South Kamchatka Reserve. The lake itself is a caldera, is of volcanic origin, and is included in the UNESCO World Heritage List.
The largest population of sockeye salmon in Eurasia spawns in Kuril Lake. The optimal number of spawners for a viable population is between 1.5 and 3.5 millions fish. In some years, as many as six million fish come here to spawn, as was in the year 1990. Sockeye spawning lasts from July to March. 71% of the spawning grounds are in the lake, 26% are riverine and 3% are in brooks. A KamchatNIRO Research Statioin is located at the outlet of the lake.
The lasting abundance of sockeye is one of the most important characteristics of this natural ecosystem. To feed on the abundance, over 200 bears come here at the end of the summer. This is the best place for observing these beautiful animals. Foxes and otters also come here to feed on salmon.